Commit | Line | Data |
---|---|---|
f721889f RW |
1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. | |
3 | * | |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/io.h> | |
12 | #include <linux/pm_runtime.h> | |
13 | #include <linux/pm_domain.h> | |
6ff7bb0d | 14 | #include <linux/pm_qos.h> |
f721889f RW |
15 | #include <linux/slab.h> |
16 | #include <linux/err.h> | |
17b75eca RW |
17 | #include <linux/sched.h> |
18 | #include <linux/suspend.h> | |
d5e4cbfe RW |
19 | #include <linux/export.h> |
20 | ||
21 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ | |
22 | ({ \ | |
23 | type (*__routine)(struct device *__d); \ | |
24 | type __ret = (type)0; \ | |
25 | \ | |
26 | __routine = genpd->dev_ops.callback; \ | |
27 | if (__routine) { \ | |
28 | __ret = __routine(dev); \ | |
29 | } else { \ | |
30 | __routine = dev_gpd_data(dev)->ops.callback; \ | |
31 | if (__routine) \ | |
32 | __ret = __routine(dev); \ | |
33 | } \ | |
34 | __ret; \ | |
35 | }) | |
f721889f | 36 | |
0140d8bd RW |
37 | #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ |
38 | ({ \ | |
39 | ktime_t __start = ktime_get(); \ | |
40 | type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ | |
41 | s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ | |
6ff7bb0d RW |
42 | struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \ |
43 | if (!__retval && __elapsed > __td->field) { \ | |
44 | __td->field = __elapsed; \ | |
0140d8bd RW |
45 | dev_warn(dev, name " latency exceeded, new value %lld ns\n", \ |
46 | __elapsed); \ | |
6ff7bb0d RW |
47 | genpd->max_off_time_changed = true; \ |
48 | __td->constraint_changed = true; \ | |
0140d8bd RW |
49 | } \ |
50 | __retval; \ | |
51 | }) | |
52 | ||
5125bbf3 RW |
53 | static LIST_HEAD(gpd_list); |
54 | static DEFINE_MUTEX(gpd_list_lock); | |
55 | ||
5248051b RW |
56 | #ifdef CONFIG_PM |
57 | ||
b02c999a | 58 | struct generic_pm_domain *dev_to_genpd(struct device *dev) |
5248051b RW |
59 | { |
60 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
61 | return ERR_PTR(-EINVAL); | |
62 | ||
596ba34b | 63 | return pd_to_genpd(dev->pm_domain); |
5248051b | 64 | } |
f721889f | 65 | |
d5e4cbfe RW |
66 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
67 | { | |
0140d8bd RW |
68 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
69 | stop_latency_ns, "stop"); | |
d5e4cbfe RW |
70 | } |
71 | ||
72 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) | |
73 | { | |
0140d8bd RW |
74 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
75 | start_latency_ns, "start"); | |
d5e4cbfe RW |
76 | } |
77 | ||
ecf00475 RW |
78 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
79 | { | |
0140d8bd RW |
80 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, |
81 | save_state_latency_ns, "state save"); | |
ecf00475 RW |
82 | } |
83 | ||
84 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) | |
85 | { | |
0140d8bd RW |
86 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, |
87 | restore_state_latency_ns, | |
88 | "state restore"); | |
ecf00475 RW |
89 | } |
90 | ||
c4bb3160 | 91 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 92 | { |
c4bb3160 RW |
93 | bool ret = false; |
94 | ||
95 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
96 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
97 | ||
98 | return ret; | |
99 | } | |
100 | ||
101 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
102 | { | |
103 | atomic_inc(&genpd->sd_count); | |
104 | smp_mb__after_atomic_inc(); | |
f721889f RW |
105 | } |
106 | ||
17b75eca RW |
107 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
108 | { | |
109 | DEFINE_WAIT(wait); | |
110 | ||
111 | mutex_lock(&genpd->lock); | |
112 | /* | |
113 | * Wait for the domain to transition into either the active, | |
114 | * or the power off state. | |
115 | */ | |
116 | for (;;) { | |
117 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
118 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
119 | if (genpd->status == GPD_STATE_ACTIVE |
120 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
121 | break; |
122 | mutex_unlock(&genpd->lock); | |
123 | ||
124 | schedule(); | |
125 | ||
126 | mutex_lock(&genpd->lock); | |
127 | } | |
128 | finish_wait(&genpd->status_wait_queue, &wait); | |
129 | } | |
130 | ||
131 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
132 | { | |
133 | mutex_unlock(&genpd->lock); | |
134 | } | |
135 | ||
c6d22b37 RW |
136 | static void genpd_set_active(struct generic_pm_domain *genpd) |
137 | { | |
138 | if (genpd->resume_count == 0) | |
139 | genpd->status = GPD_STATE_ACTIVE; | |
140 | } | |
141 | ||
5248051b | 142 | /** |
5063ce15 | 143 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
144 | * @genpd: PM domain to power up. |
145 | * | |
5063ce15 | 146 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
147 | * resume a device belonging to it. |
148 | */ | |
3f241775 RW |
149 | int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
150 | __releases(&genpd->lock) __acquires(&genpd->lock) | |
5248051b | 151 | { |
5063ce15 | 152 | struct gpd_link *link; |
3f241775 | 153 | DEFINE_WAIT(wait); |
5248051b RW |
154 | int ret = 0; |
155 | ||
5063ce15 | 156 | /* If the domain's master is being waited for, we have to wait too. */ |
3f241775 RW |
157 | for (;;) { |
158 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
159 | TASK_UNINTERRUPTIBLE); | |
17877eb5 | 160 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
3f241775 RW |
161 | break; |
162 | mutex_unlock(&genpd->lock); | |
17b75eca | 163 | |
3f241775 RW |
164 | schedule(); |
165 | ||
166 | mutex_lock(&genpd->lock); | |
167 | } | |
168 | finish_wait(&genpd->status_wait_queue, &wait); | |
9e08cf42 | 169 | |
17b75eca | 170 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 171 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 172 | return 0; |
5248051b | 173 | |
c6d22b37 RW |
174 | if (genpd->status != GPD_STATE_POWER_OFF) { |
175 | genpd_set_active(genpd); | |
3f241775 | 176 | return 0; |
c6d22b37 RW |
177 | } |
178 | ||
5063ce15 RW |
179 | /* |
180 | * The list is guaranteed not to change while the loop below is being | |
181 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
182 | * with it. | |
183 | */ | |
184 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
185 | genpd_sd_counter_inc(link->master); | |
17877eb5 | 186 | genpd->status = GPD_STATE_WAIT_MASTER; |
3c07cbc4 | 187 | |
5248051b | 188 | mutex_unlock(&genpd->lock); |
5248051b | 189 | |
5063ce15 | 190 | ret = pm_genpd_poweron(link->master); |
9e08cf42 RW |
191 | |
192 | mutex_lock(&genpd->lock); | |
193 | ||
3f241775 RW |
194 | /* |
195 | * The "wait for parent" status is guaranteed not to change | |
5063ce15 | 196 | * while the master is powering on. |
3f241775 RW |
197 | */ |
198 | genpd->status = GPD_STATE_POWER_OFF; | |
199 | wake_up_all(&genpd->status_wait_queue); | |
5063ce15 RW |
200 | if (ret) { |
201 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 202 | goto err; |
5063ce15 | 203 | } |
5248051b RW |
204 | } |
205 | ||
9e08cf42 | 206 | if (genpd->power_on) { |
0140d8bd RW |
207 | ktime_t time_start = ktime_get(); |
208 | s64 elapsed_ns; | |
209 | ||
fe202fde | 210 | ret = genpd->power_on(genpd); |
9e08cf42 RW |
211 | if (ret) |
212 | goto err; | |
0140d8bd RW |
213 | |
214 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
e84b2c20 | 215 | if (elapsed_ns > genpd->power_on_latency_ns) { |
0140d8bd | 216 | genpd->power_on_latency_ns = elapsed_ns; |
6ff7bb0d | 217 | genpd->max_off_time_changed = true; |
e84b2c20 RW |
218 | if (genpd->name) |
219 | pr_warning("%s: Power-on latency exceeded, " | |
220 | "new value %lld ns\n", genpd->name, | |
221 | elapsed_ns); | |
222 | } | |
3c07cbc4 | 223 | } |
5248051b | 224 | |
9e08cf42 RW |
225 | genpd_set_active(genpd); |
226 | ||
3f241775 | 227 | return 0; |
9e08cf42 RW |
228 | |
229 | err: | |
5063ce15 RW |
230 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
231 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 232 | |
3f241775 RW |
233 | return ret; |
234 | } | |
235 | ||
236 | /** | |
5063ce15 | 237 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
238 | * @genpd: PM domain to power up. |
239 | */ | |
240 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
241 | { | |
242 | int ret; | |
243 | ||
244 | mutex_lock(&genpd->lock); | |
245 | ret = __pm_genpd_poweron(genpd); | |
246 | mutex_unlock(&genpd->lock); | |
247 | return ret; | |
5248051b RW |
248 | } |
249 | ||
250 | #endif /* CONFIG_PM */ | |
251 | ||
252 | #ifdef CONFIG_PM_RUNTIME | |
253 | ||
6ff7bb0d RW |
254 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
255 | unsigned long val, void *ptr) | |
256 | { | |
257 | struct generic_pm_domain_data *gpd_data; | |
258 | struct device *dev; | |
259 | ||
260 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
261 | ||
262 | mutex_lock(&gpd_data->lock); | |
263 | dev = gpd_data->base.dev; | |
264 | if (!dev) { | |
265 | mutex_unlock(&gpd_data->lock); | |
266 | return NOTIFY_DONE; | |
267 | } | |
268 | mutex_unlock(&gpd_data->lock); | |
269 | ||
270 | for (;;) { | |
271 | struct generic_pm_domain *genpd; | |
272 | struct pm_domain_data *pdd; | |
273 | ||
274 | spin_lock_irq(&dev->power.lock); | |
275 | ||
276 | pdd = dev->power.subsys_data ? | |
277 | dev->power.subsys_data->domain_data : NULL; | |
278 | if (pdd) { | |
279 | to_gpd_data(pdd)->td.constraint_changed = true; | |
280 | genpd = dev_to_genpd(dev); | |
281 | } else { | |
282 | genpd = ERR_PTR(-ENODATA); | |
283 | } | |
284 | ||
285 | spin_unlock_irq(&dev->power.lock); | |
286 | ||
287 | if (!IS_ERR(genpd)) { | |
288 | mutex_lock(&genpd->lock); | |
289 | genpd->max_off_time_changed = true; | |
290 | mutex_unlock(&genpd->lock); | |
291 | } | |
292 | ||
293 | dev = dev->parent; | |
294 | if (!dev || dev->power.ignore_children) | |
295 | break; | |
296 | } | |
297 | ||
298 | return NOTIFY_DONE; | |
299 | } | |
300 | ||
f721889f RW |
301 | /** |
302 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 303 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
304 | * @genpd: PM domain the device belongs to. |
305 | */ | |
4605ab65 | 306 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
f721889f | 307 | struct generic_pm_domain *genpd) |
17b75eca | 308 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 309 | { |
cd0ea672 | 310 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 311 | struct device *dev = pdd->dev; |
f721889f RW |
312 | int ret = 0; |
313 | ||
cd0ea672 | 314 | if (gpd_data->need_restore) |
f721889f RW |
315 | return 0; |
316 | ||
17b75eca RW |
317 | mutex_unlock(&genpd->lock); |
318 | ||
ecf00475 RW |
319 | genpd_start_dev(genpd, dev); |
320 | ret = genpd_save_dev(genpd, dev); | |
321 | genpd_stop_dev(genpd, dev); | |
f721889f | 322 | |
17b75eca RW |
323 | mutex_lock(&genpd->lock); |
324 | ||
f721889f | 325 | if (!ret) |
cd0ea672 | 326 | gpd_data->need_restore = true; |
f721889f RW |
327 | |
328 | return ret; | |
329 | } | |
330 | ||
331 | /** | |
332 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 333 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
334 | * @genpd: PM domain the device belongs to. |
335 | */ | |
4605ab65 | 336 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 337 | struct generic_pm_domain *genpd) |
17b75eca | 338 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 339 | { |
cd0ea672 | 340 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 341 | struct device *dev = pdd->dev; |
f721889f | 342 | |
cd0ea672 | 343 | if (!gpd_data->need_restore) |
f721889f RW |
344 | return; |
345 | ||
17b75eca RW |
346 | mutex_unlock(&genpd->lock); |
347 | ||
ecf00475 RW |
348 | genpd_start_dev(genpd, dev); |
349 | genpd_restore_dev(genpd, dev); | |
350 | genpd_stop_dev(genpd, dev); | |
f721889f | 351 | |
17b75eca RW |
352 | mutex_lock(&genpd->lock); |
353 | ||
cd0ea672 | 354 | gpd_data->need_restore = false; |
f721889f RW |
355 | } |
356 | ||
c6d22b37 RW |
357 | /** |
358 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
359 | * @genpd: PM domain to check. | |
360 | * | |
361 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
362 | * a "power off" operation, which means that a "power on" has occured in the | |
363 | * meantime, or if its resume_count field is different from zero, which means | |
364 | * that one of its devices has been resumed in the meantime. | |
365 | */ | |
366 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
367 | { | |
17877eb5 | 368 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 369 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
370 | } |
371 | ||
56375fd4 RW |
372 | /** |
373 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
374 | * @genpd: PM domait to power off. | |
375 | * | |
376 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
377 | * before. | |
378 | */ | |
0bc5b2de | 379 | void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 RW |
380 | { |
381 | if (!work_pending(&genpd->power_off_work)) | |
382 | queue_work(pm_wq, &genpd->power_off_work); | |
383 | } | |
384 | ||
f721889f RW |
385 | /** |
386 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
387 | * @genpd: PM domain to power down. | |
388 | * | |
389 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
390 | * have been powered down, run the runtime suspend callbacks provided by all of | |
391 | * the @genpd's devices' drivers and remove power from @genpd. | |
392 | */ | |
393 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 394 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 395 | { |
4605ab65 | 396 | struct pm_domain_data *pdd; |
5063ce15 | 397 | struct gpd_link *link; |
f721889f | 398 | unsigned int not_suspended; |
c6d22b37 | 399 | int ret = 0; |
f721889f | 400 | |
c6d22b37 RW |
401 | start: |
402 | /* | |
403 | * Do not try to power off the domain in the following situations: | |
404 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 405 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 406 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 407 | * (4) System suspend is in progress. |
c6d22b37 | 408 | */ |
3f241775 | 409 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 410 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 411 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
412 | return 0; |
413 | ||
c4bb3160 | 414 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
415 | return -EBUSY; |
416 | ||
417 | not_suspended = 0; | |
4605ab65 | 418 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
0aa2a221 | 419 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
1e78a0c7 | 420 | || pdd->dev->power.irq_safe || to_gpd_data(pdd)->always_on)) |
f721889f RW |
421 | not_suspended++; |
422 | ||
423 | if (not_suspended > genpd->in_progress) | |
424 | return -EBUSY; | |
425 | ||
c6d22b37 RW |
426 | if (genpd->poweroff_task) { |
427 | /* | |
428 | * Another instance of pm_genpd_poweroff() is executing | |
429 | * callbacks, so tell it to start over and return. | |
430 | */ | |
431 | genpd->status = GPD_STATE_REPEAT; | |
432 | return 0; | |
433 | } | |
434 | ||
f721889f RW |
435 | if (genpd->gov && genpd->gov->power_down_ok) { |
436 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
437 | return -EAGAIN; | |
438 | } | |
439 | ||
17b75eca | 440 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 441 | genpd->poweroff_task = current; |
17b75eca | 442 | |
4605ab65 | 443 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 444 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 445 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
446 | |
447 | if (genpd_abort_poweroff(genpd)) | |
448 | goto out; | |
449 | ||
697a7f37 RW |
450 | if (ret) { |
451 | genpd_set_active(genpd); | |
452 | goto out; | |
453 | } | |
f721889f | 454 | |
c6d22b37 RW |
455 | if (genpd->status == GPD_STATE_REPEAT) { |
456 | genpd->poweroff_task = NULL; | |
457 | goto start; | |
458 | } | |
459 | } | |
17b75eca | 460 | |
3c07cbc4 | 461 | if (genpd->power_off) { |
0140d8bd RW |
462 | ktime_t time_start; |
463 | s64 elapsed_ns; | |
464 | ||
3c07cbc4 RW |
465 | if (atomic_read(&genpd->sd_count) > 0) { |
466 | ret = -EBUSY; | |
c6d22b37 RW |
467 | goto out; |
468 | } | |
17b75eca | 469 | |
0140d8bd RW |
470 | time_start = ktime_get(); |
471 | ||
3c07cbc4 | 472 | /* |
5063ce15 RW |
473 | * If sd_count > 0 at this point, one of the subdomains hasn't |
474 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
475 | * incrementing it. In that case pm_genpd_poweron() will wait |
476 | * for us to drop the lock, so we can call .power_off() and let | |
477 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
478 | * happen very often). | |
479 | */ | |
d2805402 RW |
480 | ret = genpd->power_off(genpd); |
481 | if (ret == -EBUSY) { | |
482 | genpd_set_active(genpd); | |
d2805402 RW |
483 | goto out; |
484 | } | |
0140d8bd RW |
485 | |
486 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
e84b2c20 | 487 | if (elapsed_ns > genpd->power_off_latency_ns) { |
0140d8bd | 488 | genpd->power_off_latency_ns = elapsed_ns; |
6ff7bb0d | 489 | genpd->max_off_time_changed = true; |
e84b2c20 RW |
490 | if (genpd->name) |
491 | pr_warning("%s: Power-off latency exceeded, " | |
492 | "new value %lld ns\n", genpd->name, | |
493 | elapsed_ns); | |
494 | } | |
d2805402 | 495 | } |
f721889f | 496 | |
17b75eca | 497 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 498 | |
5063ce15 RW |
499 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
500 | genpd_sd_counter_dec(link->master); | |
501 | genpd_queue_power_off_work(link->master); | |
502 | } | |
f721889f | 503 | |
c6d22b37 RW |
504 | out: |
505 | genpd->poweroff_task = NULL; | |
506 | wake_up_all(&genpd->status_wait_queue); | |
507 | return ret; | |
f721889f RW |
508 | } |
509 | ||
510 | /** | |
511 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
512 | * @work: Work structure used for scheduling the execution of this function. | |
513 | */ | |
514 | static void genpd_power_off_work_fn(struct work_struct *work) | |
515 | { | |
516 | struct generic_pm_domain *genpd; | |
517 | ||
518 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
519 | ||
17b75eca | 520 | genpd_acquire_lock(genpd); |
f721889f | 521 | pm_genpd_poweroff(genpd); |
17b75eca | 522 | genpd_release_lock(genpd); |
f721889f RW |
523 | } |
524 | ||
525 | /** | |
526 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
527 | * @dev: Device to suspend. | |
528 | * | |
529 | * Carry out a runtime suspend of a device under the assumption that its | |
530 | * pm_domain field points to the domain member of an object of type | |
531 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
532 | */ | |
533 | static int pm_genpd_runtime_suspend(struct device *dev) | |
534 | { | |
535 | struct generic_pm_domain *genpd; | |
b02c999a | 536 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 537 | int ret; |
f721889f RW |
538 | |
539 | dev_dbg(dev, "%s()\n", __func__); | |
540 | ||
5248051b RW |
541 | genpd = dev_to_genpd(dev); |
542 | if (IS_ERR(genpd)) | |
f721889f RW |
543 | return -EINVAL; |
544 | ||
0aa2a221 RW |
545 | might_sleep_if(!genpd->dev_irq_safe); |
546 | ||
1e78a0c7 RW |
547 | if (dev_gpd_data(dev)->always_on) |
548 | return -EBUSY; | |
549 | ||
b02c999a RW |
550 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
551 | if (stop_ok && !stop_ok(dev)) | |
552 | return -EBUSY; | |
553 | ||
d5e4cbfe RW |
554 | ret = genpd_stop_dev(genpd, dev); |
555 | if (ret) | |
556 | return ret; | |
17b75eca | 557 | |
0aa2a221 RW |
558 | /* |
559 | * If power.irq_safe is set, this routine will be run with interrupts | |
560 | * off, so it can't use mutexes. | |
561 | */ | |
562 | if (dev->power.irq_safe) | |
563 | return 0; | |
564 | ||
c6d22b37 | 565 | mutex_lock(&genpd->lock); |
f721889f RW |
566 | genpd->in_progress++; |
567 | pm_genpd_poweroff(genpd); | |
568 | genpd->in_progress--; | |
c6d22b37 | 569 | mutex_unlock(&genpd->lock); |
f721889f RW |
570 | |
571 | return 0; | |
572 | } | |
573 | ||
f721889f RW |
574 | /** |
575 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
576 | * @dev: Device to resume. | |
577 | * | |
578 | * Carry out a runtime resume of a device under the assumption that its | |
579 | * pm_domain field points to the domain member of an object of type | |
580 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
581 | */ | |
582 | static int pm_genpd_runtime_resume(struct device *dev) | |
583 | { | |
584 | struct generic_pm_domain *genpd; | |
c6d22b37 | 585 | DEFINE_WAIT(wait); |
f721889f RW |
586 | int ret; |
587 | ||
588 | dev_dbg(dev, "%s()\n", __func__); | |
589 | ||
5248051b RW |
590 | genpd = dev_to_genpd(dev); |
591 | if (IS_ERR(genpd)) | |
f721889f RW |
592 | return -EINVAL; |
593 | ||
0aa2a221 RW |
594 | might_sleep_if(!genpd->dev_irq_safe); |
595 | ||
596 | /* If power.irq_safe, the PM domain is never powered off. */ | |
597 | if (dev->power.irq_safe) | |
598 | goto out; | |
599 | ||
c6d22b37 | 600 | mutex_lock(&genpd->lock); |
3f241775 RW |
601 | ret = __pm_genpd_poweron(genpd); |
602 | if (ret) { | |
603 | mutex_unlock(&genpd->lock); | |
604 | return ret; | |
605 | } | |
17b75eca | 606 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
607 | genpd->resume_count++; |
608 | for (;;) { | |
609 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
610 | TASK_UNINTERRUPTIBLE); | |
611 | /* | |
612 | * If current is the powering off task, we have been called | |
613 | * reentrantly from one of the device callbacks, so we should | |
614 | * not wait. | |
615 | */ | |
616 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
617 | break; | |
618 | mutex_unlock(&genpd->lock); | |
619 | ||
620 | schedule(); | |
621 | ||
622 | mutex_lock(&genpd->lock); | |
623 | } | |
624 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 625 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
626 | genpd->resume_count--; |
627 | genpd_set_active(genpd); | |
17b75eca | 628 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 629 | mutex_unlock(&genpd->lock); |
17b75eca | 630 | |
0aa2a221 | 631 | out: |
d5e4cbfe | 632 | genpd_start_dev(genpd, dev); |
f721889f RW |
633 | |
634 | return 0; | |
635 | } | |
636 | ||
17f2ae7f RW |
637 | /** |
638 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
639 | */ | |
640 | void pm_genpd_poweroff_unused(void) | |
641 | { | |
642 | struct generic_pm_domain *genpd; | |
643 | ||
644 | mutex_lock(&gpd_list_lock); | |
645 | ||
646 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
647 | genpd_queue_power_off_work(genpd); | |
648 | ||
649 | mutex_unlock(&gpd_list_lock); | |
650 | } | |
651 | ||
f721889f RW |
652 | #else |
653 | ||
6ff7bb0d RW |
654 | static inline int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
655 | unsigned long val, void *ptr) | |
656 | { | |
657 | return NOTIFY_DONE; | |
658 | } | |
659 | ||
f721889f RW |
660 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} |
661 | ||
662 | #define pm_genpd_runtime_suspend NULL | |
663 | #define pm_genpd_runtime_resume NULL | |
664 | ||
665 | #endif /* CONFIG_PM_RUNTIME */ | |
666 | ||
596ba34b RW |
667 | #ifdef CONFIG_PM_SLEEP |
668 | ||
d5e4cbfe RW |
669 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
670 | struct device *dev) | |
671 | { | |
672 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
673 | } | |
674 | ||
d23b9b00 RW |
675 | static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev) |
676 | { | |
677 | return GENPD_DEV_CALLBACK(genpd, int, suspend, dev); | |
678 | } | |
679 | ||
680 | static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev) | |
681 | { | |
682 | return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev); | |
683 | } | |
684 | ||
685 | static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev) | |
686 | { | |
687 | return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev); | |
688 | } | |
689 | ||
690 | static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev) | |
691 | { | |
692 | return GENPD_DEV_CALLBACK(genpd, int, resume, dev); | |
693 | } | |
694 | ||
695 | static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev) | |
696 | { | |
697 | return GENPD_DEV_CALLBACK(genpd, int, freeze, dev); | |
698 | } | |
699 | ||
700 | static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev) | |
701 | { | |
702 | return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev); | |
703 | } | |
704 | ||
705 | static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev) | |
706 | { | |
707 | return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev); | |
708 | } | |
709 | ||
710 | static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev) | |
711 | { | |
712 | return GENPD_DEV_CALLBACK(genpd, int, thaw, dev); | |
713 | } | |
714 | ||
596ba34b | 715 | /** |
5063ce15 | 716 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
717 | * @genpd: PM domain to power off, if possible. |
718 | * | |
719 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 720 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b RW |
721 | * |
722 | * This function is only called in "noirq" stages of system power transitions, | |
723 | * so it need not acquire locks (all of the "noirq" callbacks are executed | |
724 | * sequentially, so it is guaranteed that it will never run twice in parallel). | |
725 | */ | |
726 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
727 | { | |
5063ce15 | 728 | struct gpd_link *link; |
596ba34b | 729 | |
17b75eca | 730 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
731 | return; |
732 | ||
c4bb3160 RW |
733 | if (genpd->suspended_count != genpd->device_count |
734 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
735 | return; |
736 | ||
737 | if (genpd->power_off) | |
738 | genpd->power_off(genpd); | |
739 | ||
17b75eca | 740 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
741 | |
742 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
743 | genpd_sd_counter_dec(link->master); | |
744 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
745 | } |
746 | } | |
747 | ||
4ecd6e65 RW |
748 | /** |
749 | * resume_needed - Check whether to resume a device before system suspend. | |
750 | * @dev: Device to check. | |
751 | * @genpd: PM domain the device belongs to. | |
752 | * | |
753 | * There are two cases in which a device that can wake up the system from sleep | |
754 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
755 | * to wake up the system and it has to remain active for this purpose while the | |
756 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
757 | * the system from sleep states and it generally doesn't generate wakeup signals | |
758 | * by itself (those signals are generated on its behalf by other parts of the | |
759 | * system). In the latter case it may be necessary to reconfigure the device's | |
760 | * wakeup settings during system suspend, because it may have been set up to | |
761 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
762 | * Return 'true' in either of the above cases. | |
763 | */ | |
764 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
765 | { | |
766 | bool active_wakeup; | |
767 | ||
768 | if (!device_can_wakeup(dev)) | |
769 | return false; | |
770 | ||
d5e4cbfe | 771 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
772 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
773 | } | |
774 | ||
596ba34b RW |
775 | /** |
776 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
777 | * @dev: Device to start the transition of. | |
778 | * | |
779 | * Start a power transition of a device (during a system-wide power transition) | |
780 | * under the assumption that its pm_domain field points to the domain member of | |
781 | * an object of type struct generic_pm_domain representing a PM domain | |
782 | * consisting of I/O devices. | |
783 | */ | |
784 | static int pm_genpd_prepare(struct device *dev) | |
785 | { | |
786 | struct generic_pm_domain *genpd; | |
b6c10c84 | 787 | int ret; |
596ba34b RW |
788 | |
789 | dev_dbg(dev, "%s()\n", __func__); | |
790 | ||
791 | genpd = dev_to_genpd(dev); | |
792 | if (IS_ERR(genpd)) | |
793 | return -EINVAL; | |
794 | ||
17b75eca RW |
795 | /* |
796 | * If a wakeup request is pending for the device, it should be woken up | |
797 | * at this point and a system wakeup event should be reported if it's | |
798 | * set up to wake up the system from sleep states. | |
799 | */ | |
800 | pm_runtime_get_noresume(dev); | |
801 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
802 | pm_wakeup_event(dev, 0); | |
803 | ||
804 | if (pm_wakeup_pending()) { | |
805 | pm_runtime_put_sync(dev); | |
806 | return -EBUSY; | |
807 | } | |
808 | ||
4ecd6e65 RW |
809 | if (resume_needed(dev, genpd)) |
810 | pm_runtime_resume(dev); | |
811 | ||
17b75eca | 812 | genpd_acquire_lock(genpd); |
596ba34b | 813 | |
65533bbf RW |
814 | if (genpd->prepared_count++ == 0) { |
815 | genpd->suspended_count = 0; | |
17b75eca | 816 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 817 | } |
17b75eca RW |
818 | |
819 | genpd_release_lock(genpd); | |
596ba34b RW |
820 | |
821 | if (genpd->suspend_power_off) { | |
17b75eca | 822 | pm_runtime_put_noidle(dev); |
596ba34b RW |
823 | return 0; |
824 | } | |
825 | ||
826 | /* | |
17b75eca RW |
827 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
828 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 829 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 830 | * to make it operational. |
596ba34b | 831 | */ |
17b75eca | 832 | pm_runtime_resume(dev); |
596ba34b RW |
833 | __pm_runtime_disable(dev, false); |
834 | ||
b6c10c84 RW |
835 | ret = pm_generic_prepare(dev); |
836 | if (ret) { | |
837 | mutex_lock(&genpd->lock); | |
838 | ||
839 | if (--genpd->prepared_count == 0) | |
840 | genpd->suspend_power_off = false; | |
841 | ||
842 | mutex_unlock(&genpd->lock); | |
17b75eca | 843 | pm_runtime_enable(dev); |
b6c10c84 | 844 | } |
17b75eca RW |
845 | |
846 | pm_runtime_put_sync(dev); | |
b6c10c84 | 847 | return ret; |
596ba34b RW |
848 | } |
849 | ||
850 | /** | |
851 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
852 | * @dev: Device to suspend. | |
853 | * | |
854 | * Suspend a device under the assumption that its pm_domain field points to the | |
855 | * domain member of an object of type struct generic_pm_domain representing | |
856 | * a PM domain consisting of I/O devices. | |
857 | */ | |
858 | static int pm_genpd_suspend(struct device *dev) | |
859 | { | |
860 | struct generic_pm_domain *genpd; | |
861 | ||
862 | dev_dbg(dev, "%s()\n", __func__); | |
863 | ||
864 | genpd = dev_to_genpd(dev); | |
865 | if (IS_ERR(genpd)) | |
866 | return -EINVAL; | |
867 | ||
d23b9b00 | 868 | return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev); |
596ba34b RW |
869 | } |
870 | ||
871 | /** | |
0496c8ae | 872 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
873 | * @dev: Device to suspend. |
874 | * | |
875 | * Carry out a late suspend of a device under the assumption that its | |
876 | * pm_domain field points to the domain member of an object of type | |
877 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
878 | */ | |
0496c8ae | 879 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
880 | { |
881 | struct generic_pm_domain *genpd; | |
596ba34b RW |
882 | |
883 | dev_dbg(dev, "%s()\n", __func__); | |
884 | ||
885 | genpd = dev_to_genpd(dev); | |
886 | if (IS_ERR(genpd)) | |
887 | return -EINVAL; | |
888 | ||
0496c8ae RW |
889 | return genpd->suspend_power_off ? 0 : genpd_suspend_late(genpd, dev); |
890 | } | |
596ba34b | 891 | |
0496c8ae RW |
892 | /** |
893 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
894 | * @dev: Device to suspend. | |
895 | * | |
896 | * Stop the device and remove power from the domain if all devices in it have | |
897 | * been stopped. | |
898 | */ | |
899 | static int pm_genpd_suspend_noirq(struct device *dev) | |
900 | { | |
901 | struct generic_pm_domain *genpd; | |
902 | ||
903 | dev_dbg(dev, "%s()\n", __func__); | |
904 | ||
905 | genpd = dev_to_genpd(dev); | |
906 | if (IS_ERR(genpd)) | |
907 | return -EINVAL; | |
596ba34b | 908 | |
1e78a0c7 | 909 | if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on |
0496c8ae | 910 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
911 | return 0; |
912 | ||
d5e4cbfe | 913 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
914 | |
915 | /* | |
916 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
917 | * guaranteed that this function will never run twice in parallel for | |
918 | * the same PM domain, so it is not necessary to use locking here. | |
919 | */ | |
920 | genpd->suspended_count++; | |
921 | pm_genpd_sync_poweroff(genpd); | |
922 | ||
923 | return 0; | |
924 | } | |
925 | ||
926 | /** | |
0496c8ae | 927 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
928 | * @dev: Device to resume. |
929 | * | |
0496c8ae | 930 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
931 | */ |
932 | static int pm_genpd_resume_noirq(struct device *dev) | |
933 | { | |
934 | struct generic_pm_domain *genpd; | |
935 | ||
936 | dev_dbg(dev, "%s()\n", __func__); | |
937 | ||
938 | genpd = dev_to_genpd(dev); | |
939 | if (IS_ERR(genpd)) | |
940 | return -EINVAL; | |
941 | ||
1e78a0c7 | 942 | if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on |
cc85b207 | 943 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
944 | return 0; |
945 | ||
946 | /* | |
947 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
948 | * guaranteed that this function will never run twice in parallel for | |
949 | * the same PM domain, so it is not necessary to use locking here. | |
950 | */ | |
951 | pm_genpd_poweron(genpd); | |
952 | genpd->suspended_count--; | |
596ba34b | 953 | |
0496c8ae | 954 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
955 | } |
956 | ||
957 | /** | |
0496c8ae RW |
958 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
959 | * @dev: Device to resume. | |
960 | * | |
961 | * Carry out an early resume of a device under the assumption that its | |
962 | * pm_domain field points to the domain member of an object of type | |
963 | * struct generic_pm_domain representing a power domain consisting of I/O | |
964 | * devices. | |
965 | */ | |
966 | static int pm_genpd_resume_early(struct device *dev) | |
967 | { | |
968 | struct generic_pm_domain *genpd; | |
969 | ||
970 | dev_dbg(dev, "%s()\n", __func__); | |
971 | ||
972 | genpd = dev_to_genpd(dev); | |
973 | if (IS_ERR(genpd)) | |
974 | return -EINVAL; | |
975 | ||
976 | return genpd->suspend_power_off ? 0 : genpd_resume_early(genpd, dev); | |
977 | } | |
978 | ||
979 | /** | |
980 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
981 | * @dev: Device to resume. |
982 | * | |
983 | * Resume a device under the assumption that its pm_domain field points to the | |
984 | * domain member of an object of type struct generic_pm_domain representing | |
985 | * a power domain consisting of I/O devices. | |
986 | */ | |
987 | static int pm_genpd_resume(struct device *dev) | |
988 | { | |
989 | struct generic_pm_domain *genpd; | |
990 | ||
991 | dev_dbg(dev, "%s()\n", __func__); | |
992 | ||
993 | genpd = dev_to_genpd(dev); | |
994 | if (IS_ERR(genpd)) | |
995 | return -EINVAL; | |
996 | ||
d23b9b00 | 997 | return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev); |
596ba34b RW |
998 | } |
999 | ||
1000 | /** | |
0496c8ae | 1001 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
1002 | * @dev: Device to freeze. |
1003 | * | |
1004 | * Freeze a device under the assumption that its pm_domain field points to the | |
1005 | * domain member of an object of type struct generic_pm_domain representing | |
1006 | * a power domain consisting of I/O devices. | |
1007 | */ | |
1008 | static int pm_genpd_freeze(struct device *dev) | |
1009 | { | |
1010 | struct generic_pm_domain *genpd; | |
1011 | ||
1012 | dev_dbg(dev, "%s()\n", __func__); | |
1013 | ||
1014 | genpd = dev_to_genpd(dev); | |
1015 | if (IS_ERR(genpd)) | |
1016 | return -EINVAL; | |
1017 | ||
d23b9b00 | 1018 | return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev); |
596ba34b RW |
1019 | } |
1020 | ||
1021 | /** | |
0496c8ae RW |
1022 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
1023 | * @dev: Device to freeze. | |
1024 | * | |
1025 | * Carry out a late freeze of a device under the assumption that its | |
1026 | * pm_domain field points to the domain member of an object of type | |
1027 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1028 | * devices. | |
1029 | */ | |
1030 | static int pm_genpd_freeze_late(struct device *dev) | |
1031 | { | |
1032 | struct generic_pm_domain *genpd; | |
1033 | ||
1034 | dev_dbg(dev, "%s()\n", __func__); | |
1035 | ||
1036 | genpd = dev_to_genpd(dev); | |
1037 | if (IS_ERR(genpd)) | |
1038 | return -EINVAL; | |
1039 | ||
1040 | return genpd->suspend_power_off ? 0 : genpd_freeze_late(genpd, dev); | |
1041 | } | |
1042 | ||
1043 | /** | |
1044 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
1045 | * @dev: Device to freeze. |
1046 | * | |
1047 | * Carry out a late freeze of a device under the assumption that its | |
1048 | * pm_domain field points to the domain member of an object of type | |
1049 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1050 | * devices. | |
1051 | */ | |
1052 | static int pm_genpd_freeze_noirq(struct device *dev) | |
1053 | { | |
1054 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1055 | |
1056 | dev_dbg(dev, "%s()\n", __func__); | |
1057 | ||
1058 | genpd = dev_to_genpd(dev); | |
1059 | if (IS_ERR(genpd)) | |
1060 | return -EINVAL; | |
1061 | ||
1e78a0c7 RW |
1062 | return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ? |
1063 | 0 : genpd_stop_dev(genpd, dev); | |
0496c8ae | 1064 | } |
596ba34b | 1065 | |
0496c8ae RW |
1066 | /** |
1067 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1068 | * @dev: Device to thaw. | |
1069 | * | |
1070 | * Start the device, unless power has been removed from the domain already | |
1071 | * before the system transition. | |
1072 | */ | |
1073 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1074 | { | |
1075 | struct generic_pm_domain *genpd; | |
596ba34b | 1076 | |
0496c8ae | 1077 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1078 | |
0496c8ae RW |
1079 | genpd = dev_to_genpd(dev); |
1080 | if (IS_ERR(genpd)) | |
1081 | return -EINVAL; | |
1082 | ||
1e78a0c7 RW |
1083 | return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ? |
1084 | 0 : genpd_start_dev(genpd, dev); | |
596ba34b RW |
1085 | } |
1086 | ||
1087 | /** | |
0496c8ae | 1088 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1089 | * @dev: Device to thaw. |
1090 | * | |
1091 | * Carry out an early thaw of a device under the assumption that its | |
1092 | * pm_domain field points to the domain member of an object of type | |
1093 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1094 | * devices. | |
1095 | */ | |
0496c8ae | 1096 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
1097 | { |
1098 | struct generic_pm_domain *genpd; | |
1099 | ||
1100 | dev_dbg(dev, "%s()\n", __func__); | |
1101 | ||
1102 | genpd = dev_to_genpd(dev); | |
1103 | if (IS_ERR(genpd)) | |
1104 | return -EINVAL; | |
1105 | ||
0496c8ae | 1106 | return genpd->suspend_power_off ? 0 : genpd_thaw_early(genpd, dev); |
596ba34b RW |
1107 | } |
1108 | ||
1109 | /** | |
1110 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1111 | * @dev: Device to thaw. | |
1112 | * | |
1113 | * Thaw a device under the assumption that its pm_domain field points to the | |
1114 | * domain member of an object of type struct generic_pm_domain representing | |
1115 | * a power domain consisting of I/O devices. | |
1116 | */ | |
1117 | static int pm_genpd_thaw(struct device *dev) | |
1118 | { | |
1119 | struct generic_pm_domain *genpd; | |
1120 | ||
1121 | dev_dbg(dev, "%s()\n", __func__); | |
1122 | ||
1123 | genpd = dev_to_genpd(dev); | |
1124 | if (IS_ERR(genpd)) | |
1125 | return -EINVAL; | |
1126 | ||
d23b9b00 | 1127 | return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev); |
596ba34b RW |
1128 | } |
1129 | ||
1130 | /** | |
0496c8ae | 1131 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1132 | * @dev: Device to resume. |
1133 | * | |
0496c8ae RW |
1134 | * Make sure the domain will be in the same power state as before the |
1135 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1136 | */ |
1137 | static int pm_genpd_restore_noirq(struct device *dev) | |
1138 | { | |
1139 | struct generic_pm_domain *genpd; | |
1140 | ||
1141 | dev_dbg(dev, "%s()\n", __func__); | |
1142 | ||
1143 | genpd = dev_to_genpd(dev); | |
1144 | if (IS_ERR(genpd)) | |
1145 | return -EINVAL; | |
1146 | ||
1147 | /* | |
1148 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1149 | * guaranteed that this function will never run twice in parallel for | |
1150 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1151 | * |
1152 | * At this point suspended_count == 0 means we are being run for the | |
1153 | * first time for the given domain in the present cycle. | |
596ba34b | 1154 | */ |
65533bbf | 1155 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1156 | /* |
65533bbf RW |
1157 | * The boot kernel might put the domain into arbitrary state, |
1158 | * so make it appear as powered off to pm_genpd_poweron(), so | |
1159 | * that it tries to power it on in case it was really off. | |
596ba34b | 1160 | */ |
65533bbf RW |
1161 | genpd->status = GPD_STATE_POWER_OFF; |
1162 | if (genpd->suspend_power_off) { | |
1163 | /* | |
1164 | * If the domain was off before the hibernation, make | |
1165 | * sure it will be off going forward. | |
1166 | */ | |
1167 | if (genpd->power_off) | |
1168 | genpd->power_off(genpd); | |
1169 | ||
1170 | return 0; | |
1171 | } | |
596ba34b RW |
1172 | } |
1173 | ||
18dd2ece RW |
1174 | if (genpd->suspend_power_off) |
1175 | return 0; | |
1176 | ||
596ba34b | 1177 | pm_genpd_poweron(genpd); |
596ba34b | 1178 | |
1e78a0c7 | 1179 | return dev_gpd_data(dev)->always_on ? 0 : genpd_start_dev(genpd, dev); |
596ba34b RW |
1180 | } |
1181 | ||
1182 | /** | |
1183 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1184 | * @dev: Device to complete the transition of. | |
1185 | * | |
1186 | * Complete a power transition of a device (during a system-wide power | |
1187 | * transition) under the assumption that its pm_domain field points to the | |
1188 | * domain member of an object of type struct generic_pm_domain representing | |
1189 | * a power domain consisting of I/O devices. | |
1190 | */ | |
1191 | static void pm_genpd_complete(struct device *dev) | |
1192 | { | |
1193 | struct generic_pm_domain *genpd; | |
1194 | bool run_complete; | |
1195 | ||
1196 | dev_dbg(dev, "%s()\n", __func__); | |
1197 | ||
1198 | genpd = dev_to_genpd(dev); | |
1199 | if (IS_ERR(genpd)) | |
1200 | return; | |
1201 | ||
1202 | mutex_lock(&genpd->lock); | |
1203 | ||
1204 | run_complete = !genpd->suspend_power_off; | |
1205 | if (--genpd->prepared_count == 0) | |
1206 | genpd->suspend_power_off = false; | |
1207 | ||
1208 | mutex_unlock(&genpd->lock); | |
1209 | ||
1210 | if (run_complete) { | |
1211 | pm_generic_complete(dev); | |
6f00ff78 | 1212 | pm_runtime_set_active(dev); |
596ba34b | 1213 | pm_runtime_enable(dev); |
6f00ff78 | 1214 | pm_runtime_idle(dev); |
596ba34b RW |
1215 | } |
1216 | } | |
1217 | ||
1218 | #else | |
1219 | ||
1220 | #define pm_genpd_prepare NULL | |
1221 | #define pm_genpd_suspend NULL | |
0496c8ae | 1222 | #define pm_genpd_suspend_late NULL |
596ba34b | 1223 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1224 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1225 | #define pm_genpd_resume_noirq NULL |
1226 | #define pm_genpd_resume NULL | |
1227 | #define pm_genpd_freeze NULL | |
0496c8ae | 1228 | #define pm_genpd_freeze_late NULL |
596ba34b | 1229 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1230 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1231 | #define pm_genpd_thaw_noirq NULL |
1232 | #define pm_genpd_thaw NULL | |
596ba34b | 1233 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1234 | #define pm_genpd_complete NULL |
1235 | ||
1236 | #endif /* CONFIG_PM_SLEEP */ | |
1237 | ||
f721889f | 1238 | /** |
b02c999a | 1239 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1240 | * @genpd: PM domain to add the device to. |
1241 | * @dev: Device to be added. | |
b02c999a | 1242 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1243 | */ |
b02c999a RW |
1244 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1245 | struct gpd_timing_data *td) | |
f721889f | 1246 | { |
cd0ea672 | 1247 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1248 | struct pm_domain_data *pdd; |
f721889f RW |
1249 | int ret = 0; |
1250 | ||
1251 | dev_dbg(dev, "%s()\n", __func__); | |
1252 | ||
1253 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1254 | return -EINVAL; | |
1255 | ||
6ff7bb0d RW |
1256 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); |
1257 | if (!gpd_data) | |
1258 | return -ENOMEM; | |
1259 | ||
1260 | mutex_init(&gpd_data->lock); | |
1261 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1262 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1263 | ||
17b75eca | 1264 | genpd_acquire_lock(genpd); |
f721889f | 1265 | |
596ba34b RW |
1266 | if (genpd->prepared_count > 0) { |
1267 | ret = -EAGAIN; | |
1268 | goto out; | |
1269 | } | |
1270 | ||
4605ab65 RW |
1271 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1272 | if (pdd->dev == dev) { | |
f721889f RW |
1273 | ret = -EINVAL; |
1274 | goto out; | |
1275 | } | |
1276 | ||
596ba34b | 1277 | genpd->device_count++; |
6ff7bb0d | 1278 | genpd->max_off_time_changed = true; |
f721889f | 1279 | |
4605ab65 | 1280 | dev_pm_get_subsys_data(dev); |
6ff7bb0d RW |
1281 | |
1282 | mutex_lock(&gpd_data->lock); | |
1283 | spin_lock_irq(&dev->power.lock); | |
1284 | dev->pm_domain = &genpd->domain; | |
cd0ea672 RW |
1285 | dev->power.subsys_data->domain_data = &gpd_data->base; |
1286 | gpd_data->base.dev = dev; | |
cd0ea672 | 1287 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
ca1d72f0 | 1288 | gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF; |
b02c999a RW |
1289 | if (td) |
1290 | gpd_data->td = *td; | |
f721889f | 1291 | |
6ff7bb0d RW |
1292 | gpd_data->td.constraint_changed = true; |
1293 | gpd_data->td.effective_constraint_ns = -1; | |
1294 | spin_unlock_irq(&dev->power.lock); | |
1295 | mutex_unlock(&gpd_data->lock); | |
1296 | ||
1297 | genpd_release_lock(genpd); | |
1298 | ||
1299 | return 0; | |
1300 | ||
f721889f | 1301 | out: |
17b75eca | 1302 | genpd_release_lock(genpd); |
f721889f | 1303 | |
6ff7bb0d RW |
1304 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); |
1305 | kfree(gpd_data); | |
f721889f RW |
1306 | return ret; |
1307 | } | |
1308 | ||
c8aa130b TA |
1309 | /** |
1310 | * __pm_genpd_of_add_device - Add a device to an I/O PM domain. | |
1311 | * @genpd_node: Device tree node pointer representing a PM domain to which the | |
1312 | * the device is added to. | |
1313 | * @dev: Device to be added. | |
1314 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1315 | */ | |
1316 | int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev, | |
1317 | struct gpd_timing_data *td) | |
1318 | { | |
1319 | struct generic_pm_domain *genpd = NULL, *gpd; | |
1320 | ||
1321 | dev_dbg(dev, "%s()\n", __func__); | |
1322 | ||
1323 | if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev)) | |
1324 | return -EINVAL; | |
1325 | ||
1326 | mutex_lock(&gpd_list_lock); | |
1327 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1328 | if (gpd->of_node == genpd_node) { | |
1329 | genpd = gpd; | |
1330 | break; | |
1331 | } | |
1332 | } | |
1333 | mutex_unlock(&gpd_list_lock); | |
1334 | ||
1335 | if (!genpd) | |
1336 | return -EINVAL; | |
1337 | ||
1338 | return __pm_genpd_add_device(genpd, dev, td); | |
1339 | } | |
1340 | ||
f721889f RW |
1341 | /** |
1342 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1343 | * @genpd: PM domain to remove the device from. | |
1344 | * @dev: Device to be removed. | |
1345 | */ | |
1346 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1347 | struct device *dev) | |
1348 | { | |
6ff7bb0d | 1349 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1350 | struct pm_domain_data *pdd; |
efa69025 | 1351 | int ret = 0; |
f721889f RW |
1352 | |
1353 | dev_dbg(dev, "%s()\n", __func__); | |
1354 | ||
efa69025 RW |
1355 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev) |
1356 | || IS_ERR_OR_NULL(dev->pm_domain) | |
1357 | || pd_to_genpd(dev->pm_domain) != genpd) | |
f721889f RW |
1358 | return -EINVAL; |
1359 | ||
17b75eca | 1360 | genpd_acquire_lock(genpd); |
f721889f | 1361 | |
596ba34b RW |
1362 | if (genpd->prepared_count > 0) { |
1363 | ret = -EAGAIN; | |
1364 | goto out; | |
1365 | } | |
1366 | ||
6ff7bb0d RW |
1367 | genpd->device_count--; |
1368 | genpd->max_off_time_changed = true; | |
1369 | ||
1370 | spin_lock_irq(&dev->power.lock); | |
efa69025 RW |
1371 | dev->pm_domain = NULL; |
1372 | pdd = dev->power.subsys_data->domain_data; | |
1373 | list_del_init(&pdd->list_node); | |
1374 | dev->power.subsys_data->domain_data = NULL; | |
6ff7bb0d | 1375 | spin_unlock_irq(&dev->power.lock); |
f721889f | 1376 | |
6ff7bb0d RW |
1377 | gpd_data = to_gpd_data(pdd); |
1378 | mutex_lock(&gpd_data->lock); | |
1379 | pdd->dev = NULL; | |
1380 | mutex_unlock(&gpd_data->lock); | |
1381 | ||
1382 | genpd_release_lock(genpd); | |
1383 | ||
1384 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1385 | kfree(gpd_data); | |
1386 | dev_pm_put_subsys_data(dev); | |
1387 | return 0; | |
f721889f | 1388 | |
596ba34b | 1389 | out: |
17b75eca | 1390 | genpd_release_lock(genpd); |
f721889f RW |
1391 | |
1392 | return ret; | |
1393 | } | |
1394 | ||
1e78a0c7 RW |
1395 | /** |
1396 | * pm_genpd_dev_always_on - Set/unset the "always on" flag for a given device. | |
1397 | * @dev: Device to set/unset the flag for. | |
1398 | * @val: The new value of the device's "always on" flag. | |
1399 | */ | |
1400 | void pm_genpd_dev_always_on(struct device *dev, bool val) | |
1401 | { | |
1402 | struct pm_subsys_data *psd; | |
1403 | unsigned long flags; | |
1404 | ||
1405 | spin_lock_irqsave(&dev->power.lock, flags); | |
1406 | ||
1407 | psd = dev_to_psd(dev); | |
1408 | if (psd && psd->domain_data) | |
1409 | to_gpd_data(psd->domain_data)->always_on = val; | |
1410 | ||
1411 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1412 | } | |
1413 | EXPORT_SYMBOL_GPL(pm_genpd_dev_always_on); | |
1414 | ||
ca1d72f0 RW |
1415 | /** |
1416 | * pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag. | |
1417 | * @dev: Device to set/unset the flag for. | |
1418 | * @val: The new value of the device's "need restore" flag. | |
1419 | */ | |
1420 | void pm_genpd_dev_need_restore(struct device *dev, bool val) | |
1421 | { | |
1422 | struct pm_subsys_data *psd; | |
1423 | unsigned long flags; | |
1424 | ||
1425 | spin_lock_irqsave(&dev->power.lock, flags); | |
1426 | ||
1427 | psd = dev_to_psd(dev); | |
1428 | if (psd && psd->domain_data) | |
1429 | to_gpd_data(psd->domain_data)->need_restore = val; | |
1430 | ||
1431 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1432 | } | |
1433 | EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore); | |
1434 | ||
f721889f RW |
1435 | /** |
1436 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1437 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1438 | * @subdomain: Subdomain to be added. |
f721889f RW |
1439 | */ |
1440 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1441 | struct generic_pm_domain *subdomain) |
f721889f | 1442 | { |
5063ce15 | 1443 | struct gpd_link *link; |
f721889f RW |
1444 | int ret = 0; |
1445 | ||
bc0403ff | 1446 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1447 | return -EINVAL; |
1448 | ||
17b75eca RW |
1449 | start: |
1450 | genpd_acquire_lock(genpd); | |
bc0403ff | 1451 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1452 | |
bc0403ff RW |
1453 | if (subdomain->status != GPD_STATE_POWER_OFF |
1454 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1455 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1456 | genpd_release_lock(genpd); |
1457 | goto start; | |
1458 | } | |
1459 | ||
1460 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1461 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1462 | ret = -EINVAL; |
1463 | goto out; | |
1464 | } | |
1465 | ||
4fcac10d | 1466 | list_for_each_entry(link, &genpd->master_links, master_node) { |
bc0403ff | 1467 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1468 | ret = -EINVAL; |
1469 | goto out; | |
1470 | } | |
1471 | } | |
1472 | ||
5063ce15 RW |
1473 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1474 | if (!link) { | |
1475 | ret = -ENOMEM; | |
1476 | goto out; | |
1477 | } | |
1478 | link->master = genpd; | |
1479 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1480 | link->slave = subdomain; |
1481 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1482 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1483 | genpd_sd_counter_inc(genpd); |
f721889f | 1484 | |
f721889f | 1485 | out: |
bc0403ff | 1486 | mutex_unlock(&subdomain->lock); |
17b75eca | 1487 | genpd_release_lock(genpd); |
f721889f RW |
1488 | |
1489 | return ret; | |
1490 | } | |
1491 | ||
1492 | /** | |
1493 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1494 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1495 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1496 | */ |
1497 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1498 | struct generic_pm_domain *subdomain) |
f721889f | 1499 | { |
5063ce15 | 1500 | struct gpd_link *link; |
f721889f RW |
1501 | int ret = -EINVAL; |
1502 | ||
5063ce15 | 1503 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1504 | return -EINVAL; |
1505 | ||
17b75eca RW |
1506 | start: |
1507 | genpd_acquire_lock(genpd); | |
f721889f | 1508 | |
5063ce15 RW |
1509 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1510 | if (link->slave != subdomain) | |
f721889f RW |
1511 | continue; |
1512 | ||
1513 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1514 | ||
17b75eca RW |
1515 | if (subdomain->status != GPD_STATE_POWER_OFF |
1516 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1517 | mutex_unlock(&subdomain->lock); | |
1518 | genpd_release_lock(genpd); | |
1519 | goto start; | |
1520 | } | |
1521 | ||
5063ce15 RW |
1522 | list_del(&link->master_node); |
1523 | list_del(&link->slave_node); | |
1524 | kfree(link); | |
17b75eca | 1525 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1526 | genpd_sd_counter_dec(genpd); |
1527 | ||
1528 | mutex_unlock(&subdomain->lock); | |
1529 | ||
1530 | ret = 0; | |
1531 | break; | |
1532 | } | |
1533 | ||
17b75eca | 1534 | genpd_release_lock(genpd); |
f721889f RW |
1535 | |
1536 | return ret; | |
1537 | } | |
1538 | ||
d5e4cbfe RW |
1539 | /** |
1540 | * pm_genpd_add_callbacks - Add PM domain callbacks to a given device. | |
1541 | * @dev: Device to add the callbacks to. | |
1542 | * @ops: Set of callbacks to add. | |
b02c999a | 1543 | * @td: Timing data to add to the device along with the callbacks (optional). |
d5e4cbfe | 1544 | */ |
b02c999a RW |
1545 | int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops, |
1546 | struct gpd_timing_data *td) | |
d5e4cbfe RW |
1547 | { |
1548 | struct pm_domain_data *pdd; | |
1549 | int ret = 0; | |
1550 | ||
1551 | if (!(dev && dev->power.subsys_data && ops)) | |
1552 | return -EINVAL; | |
1553 | ||
1554 | pm_runtime_disable(dev); | |
1555 | device_pm_lock(); | |
1556 | ||
1557 | pdd = dev->power.subsys_data->domain_data; | |
1558 | if (pdd) { | |
1559 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); | |
1560 | ||
1561 | gpd_data->ops = *ops; | |
b02c999a RW |
1562 | if (td) |
1563 | gpd_data->td = *td; | |
d5e4cbfe RW |
1564 | } else { |
1565 | ret = -EINVAL; | |
1566 | } | |
1567 | ||
1568 | device_pm_unlock(); | |
1569 | pm_runtime_enable(dev); | |
1570 | ||
1571 | return ret; | |
1572 | } | |
1573 | EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks); | |
1574 | ||
1575 | /** | |
b02c999a | 1576 | * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device. |
d5e4cbfe | 1577 | * @dev: Device to remove the callbacks from. |
b02c999a | 1578 | * @clear_td: If set, clear the device's timing data too. |
d5e4cbfe | 1579 | */ |
b02c999a | 1580 | int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td) |
d5e4cbfe RW |
1581 | { |
1582 | struct pm_domain_data *pdd; | |
1583 | int ret = 0; | |
1584 | ||
1585 | if (!(dev && dev->power.subsys_data)) | |
1586 | return -EINVAL; | |
1587 | ||
1588 | pm_runtime_disable(dev); | |
1589 | device_pm_lock(); | |
1590 | ||
1591 | pdd = dev->power.subsys_data->domain_data; | |
1592 | if (pdd) { | |
1593 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); | |
1594 | ||
1595 | gpd_data->ops = (struct gpd_dev_ops){ 0 }; | |
b02c999a RW |
1596 | if (clear_td) |
1597 | gpd_data->td = (struct gpd_timing_data){ 0 }; | |
d5e4cbfe RW |
1598 | } else { |
1599 | ret = -EINVAL; | |
1600 | } | |
1601 | ||
1602 | device_pm_unlock(); | |
1603 | pm_runtime_enable(dev); | |
1604 | ||
1605 | return ret; | |
1606 | } | |
b02c999a | 1607 | EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks); |
d5e4cbfe | 1608 | |
d23b9b00 RW |
1609 | /* Default device callbacks for generic PM domains. */ |
1610 | ||
ecf00475 RW |
1611 | /** |
1612 | * pm_genpd_default_save_state - Default "save device state" for PM domians. | |
1613 | * @dev: Device to handle. | |
1614 | */ | |
1615 | static int pm_genpd_default_save_state(struct device *dev) | |
1616 | { | |
1617 | int (*cb)(struct device *__dev); | |
ecf00475 RW |
1618 | |
1619 | cb = dev_gpd_data(dev)->ops.save_state; | |
1620 | if (cb) | |
1621 | return cb(dev); | |
1622 | ||
0b589741 RW |
1623 | if (dev->type && dev->type->pm) |
1624 | cb = dev->type->pm->runtime_suspend; | |
1625 | else if (dev->class && dev->class->pm) | |
1626 | cb = dev->class->pm->runtime_suspend; | |
1627 | else if (dev->bus && dev->bus->pm) | |
1628 | cb = dev->bus->pm->runtime_suspend; | |
1629 | else | |
1630 | cb = NULL; | |
ecf00475 | 1631 | |
0b589741 RW |
1632 | if (!cb && dev->driver && dev->driver->pm) |
1633 | cb = dev->driver->pm->runtime_suspend; | |
1634 | ||
1635 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1636 | } |
1637 | ||
1638 | /** | |
1639 | * pm_genpd_default_restore_state - Default PM domians "restore device state". | |
1640 | * @dev: Device to handle. | |
1641 | */ | |
1642 | static int pm_genpd_default_restore_state(struct device *dev) | |
1643 | { | |
1644 | int (*cb)(struct device *__dev); | |
ecf00475 RW |
1645 | |
1646 | cb = dev_gpd_data(dev)->ops.restore_state; | |
1647 | if (cb) | |
1648 | return cb(dev); | |
1649 | ||
0b589741 RW |
1650 | if (dev->type && dev->type->pm) |
1651 | cb = dev->type->pm->runtime_resume; | |
1652 | else if (dev->class && dev->class->pm) | |
1653 | cb = dev->class->pm->runtime_resume; | |
1654 | else if (dev->bus && dev->bus->pm) | |
1655 | cb = dev->bus->pm->runtime_resume; | |
1656 | else | |
1657 | cb = NULL; | |
ecf00475 | 1658 | |
0b589741 RW |
1659 | if (!cb && dev->driver && dev->driver->pm) |
1660 | cb = dev->driver->pm->runtime_resume; | |
1661 | ||
1662 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1663 | } |
1664 | ||
0f1d6986 RW |
1665 | #ifdef CONFIG_PM_SLEEP |
1666 | ||
d23b9b00 RW |
1667 | /** |
1668 | * pm_genpd_default_suspend - Default "device suspend" for PM domians. | |
1669 | * @dev: Device to handle. | |
1670 | */ | |
1671 | static int pm_genpd_default_suspend(struct device *dev) | |
1672 | { | |
c9914854 | 1673 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend; |
d23b9b00 RW |
1674 | |
1675 | return cb ? cb(dev) : pm_generic_suspend(dev); | |
1676 | } | |
1677 | ||
1678 | /** | |
1679 | * pm_genpd_default_suspend_late - Default "late device suspend" for PM domians. | |
1680 | * @dev: Device to handle. | |
1681 | */ | |
1682 | static int pm_genpd_default_suspend_late(struct device *dev) | |
1683 | { | |
c9914854 | 1684 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend_late; |
d23b9b00 | 1685 | |
0496c8ae | 1686 | return cb ? cb(dev) : pm_generic_suspend_late(dev); |
d23b9b00 RW |
1687 | } |
1688 | ||
1689 | /** | |
1690 | * pm_genpd_default_resume_early - Default "early device resume" for PM domians. | |
1691 | * @dev: Device to handle. | |
1692 | */ | |
1693 | static int pm_genpd_default_resume_early(struct device *dev) | |
1694 | { | |
c9914854 | 1695 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume_early; |
d23b9b00 | 1696 | |
0496c8ae | 1697 | return cb ? cb(dev) : pm_generic_resume_early(dev); |
d23b9b00 RW |
1698 | } |
1699 | ||
1700 | /** | |
1701 | * pm_genpd_default_resume - Default "device resume" for PM domians. | |
1702 | * @dev: Device to handle. | |
1703 | */ | |
1704 | static int pm_genpd_default_resume(struct device *dev) | |
1705 | { | |
c9914854 | 1706 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume; |
d23b9b00 RW |
1707 | |
1708 | return cb ? cb(dev) : pm_generic_resume(dev); | |
1709 | } | |
1710 | ||
1711 | /** | |
1712 | * pm_genpd_default_freeze - Default "device freeze" for PM domians. | |
1713 | * @dev: Device to handle. | |
1714 | */ | |
1715 | static int pm_genpd_default_freeze(struct device *dev) | |
1716 | { | |
1717 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; | |
1718 | ||
1719 | return cb ? cb(dev) : pm_generic_freeze(dev); | |
1720 | } | |
1721 | ||
1722 | /** | |
1723 | * pm_genpd_default_freeze_late - Default "late device freeze" for PM domians. | |
1724 | * @dev: Device to handle. | |
1725 | */ | |
1726 | static int pm_genpd_default_freeze_late(struct device *dev) | |
1727 | { | |
1728 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; | |
1729 | ||
0496c8ae | 1730 | return cb ? cb(dev) : pm_generic_freeze_late(dev); |
d23b9b00 RW |
1731 | } |
1732 | ||
1733 | /** | |
1734 | * pm_genpd_default_thaw_early - Default "early device thaw" for PM domians. | |
1735 | * @dev: Device to handle. | |
1736 | */ | |
1737 | static int pm_genpd_default_thaw_early(struct device *dev) | |
1738 | { | |
1739 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; | |
1740 | ||
0496c8ae | 1741 | return cb ? cb(dev) : pm_generic_thaw_early(dev); |
d23b9b00 RW |
1742 | } |
1743 | ||
1744 | /** | |
1745 | * pm_genpd_default_thaw - Default "device thaw" for PM domians. | |
1746 | * @dev: Device to handle. | |
1747 | */ | |
1748 | static int pm_genpd_default_thaw(struct device *dev) | |
1749 | { | |
1750 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; | |
1751 | ||
1752 | return cb ? cb(dev) : pm_generic_thaw(dev); | |
1753 | } | |
1754 | ||
0f1d6986 RW |
1755 | #else /* !CONFIG_PM_SLEEP */ |
1756 | ||
1757 | #define pm_genpd_default_suspend NULL | |
1758 | #define pm_genpd_default_suspend_late NULL | |
1759 | #define pm_genpd_default_resume_early NULL | |
1760 | #define pm_genpd_default_resume NULL | |
1761 | #define pm_genpd_default_freeze NULL | |
1762 | #define pm_genpd_default_freeze_late NULL | |
1763 | #define pm_genpd_default_thaw_early NULL | |
1764 | #define pm_genpd_default_thaw NULL | |
1765 | ||
1766 | #endif /* !CONFIG_PM_SLEEP */ | |
1767 | ||
f721889f RW |
1768 | /** |
1769 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1770 | * @genpd: PM domain object to initialize. | |
1771 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1772 | * @is_off: Initial value of the domain's power_is_off field. | |
1773 | */ | |
1774 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1775 | struct dev_power_governor *gov, bool is_off) | |
1776 | { | |
1777 | if (IS_ERR_OR_NULL(genpd)) | |
1778 | return; | |
1779 | ||
5063ce15 RW |
1780 | INIT_LIST_HEAD(&genpd->master_links); |
1781 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1782 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1783 | mutex_init(&genpd->lock); |
1784 | genpd->gov = gov; | |
1785 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1786 | genpd->in_progress = 0; | |
c4bb3160 | 1787 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1788 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1789 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1790 | genpd->poweroff_task = NULL; |
1791 | genpd->resume_count = 0; | |
596ba34b | 1792 | genpd->device_count = 0; |
221e9b58 | 1793 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1794 | genpd->max_off_time_changed = true; |
f721889f RW |
1795 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1796 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
1797 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
1798 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1799 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1800 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1801 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1802 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1803 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1804 | genpd->domain.ops.resume = pm_genpd_resume; |
1805 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1806 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1807 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1808 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1809 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1810 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1811 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1812 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1813 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1814 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1815 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1816 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1817 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1818 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1819 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
c9914854 RW |
1820 | genpd->dev_ops.suspend = pm_genpd_default_suspend; |
1821 | genpd->dev_ops.suspend_late = pm_genpd_default_suspend_late; | |
1822 | genpd->dev_ops.resume_early = pm_genpd_default_resume_early; | |
1823 | genpd->dev_ops.resume = pm_genpd_default_resume; | |
d23b9b00 RW |
1824 | genpd->dev_ops.freeze = pm_genpd_default_freeze; |
1825 | genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late; | |
1826 | genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early; | |
1827 | genpd->dev_ops.thaw = pm_genpd_default_thaw; | |
5125bbf3 RW |
1828 | mutex_lock(&gpd_list_lock); |
1829 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1830 | mutex_unlock(&gpd_list_lock); | |
1831 | } |